In-line storm water drain filter system

Abstract

An in-line storm water drain filter and baffle box is installed within a storm water drain pipe to direct storm water runoff through the storm water drain pipe and through the filter and baffle box prior to the storm water drain water passing through an outfall into a lake, pond or retention area. The filter system includes a housing having an inlet and an outlet and a plurality of chambers formed therein. A housing cover allows for access into the housing and a plurality of filter screens are mounted over each of the plurality of housing chambers for collecting trash from the storm water passing therethrough. The housing has a generally arcuate bottom. The filter system also has inlet and outlet cover frames for holding removably mounted blocker dampers for blocking the ingress and egress of storm drain water during cleaning of the filter system. An oil collection boom is removably mounted in the housing adjacent the inlet for collecting oil in the drain water entering the housing inlet. A method of cleaning the storm water drain filter system selects the filter system apparatus and blocks the egress and ingress of drain water while the system is being cleaned.

I claim:  
     
       1. An in-line storm water drain filter system comprising: 
       a housing having an inlet thereinto and an outlet therefrom and having a plurality of chambers formed therein below said inlet;  
       a housing cover for access into said housing;  
       a filter screen mounted over each of a plurality of said housing chambers for collecting trash from said storm water passing therethrough, each said filter screen being movable to allow access to the housing chamber therebeneath;  
       an inlet filter screen removably mounted adjacent said housing inlet for filtering drain water entering said inlet; and  
       an oil sorbent boom removably mounted in said housing above one said housing chamber for collecting oil in the drain water entering said housing inlet; whereby an in-line storm water drain filter system filters materials from drain water passing through said storm water drain.  
     
     
       2. An in-line storm water drain filter system in accordance with  claim 1  including a baffle for maintaining sediments located within each of a plurality of said housing chambers. 
     
     
       3. An in-line storm water drain filter system in accordance with  claim 2  in which each said filter screen mounted over each said chamber is hinged to said housing to allow said filter screen to swing to an open position for entrance to said chamber. 
     
     
       4. An in-line storm water drain filter system in accordance with  claim 3  including an outlet filter screen removably mounted adjacent said housing outlet for filtering drain water egressing from said housing. 
     
     
       5. An in-line storm water drain filter system in accordance with  claim 4  including an inlet filter screen frame mounted adjacent said inlet for removably holding said inlet filter screen. 
     
     
       6. An in-line storm water drain filter system in accordance with  claim 5  including an output filter screen frame mounted adjacent said output for removably holding said outlet filter screen. 
     
     
       7. An in-line storm water drain filter system in accordance with  claim 6  including a trash deflector member positioned adjacent the chamber covering the screen positioned nearest said outlet for deflecting trash from said outlet. 
     
     
       8. An in-line storm water drain filter system in accordance with  claim 7  in which each of said plurality of filter screens mounted over a plurality of housing chambers is positioned in a generally horizontal row to received drain water directly thereunto from said inlet. 
     
     
       9. An in-line storm water drain filter system in accordance with  claim 8  in which said inlet filter screen is mounted over said inlet and generally perpendicular to said plurality of filter screens. 
     
     
       10. An in-line storm water drain filter system in accordance with  claim 9  in which said outlet filter screen is mounted over said outlet and generally perpendicular to said plurality of filter screens. 
     
     
       11. An in-line storm water drain filter system in accordance with  claim 10  in which said housing has a generally arcuate floor. 
     
     
       12. An in-line storm water drain filter system in accordance with  claim 11  in which said housing is made of a polymer material. 
     
     
       13. An in-line storm water drain filter system in accordance with  claim 11  in which said housing is made of concrete.